What is Grammar Fixer?

Grammar Fixer is Zerlo's free online platform for spelling and grammar error correction. Using state-of-the-art LLM technology, errors are automatically detected and highlighted directly in the text.

Our basic functionality remains permanently free and allows unlimited document lengths—whether you want to check short notes or extensive reports. For advanced requirements, we offer premium features such as style and tone analysis, plagiarism checking, and AI-powered rewrites.

Upload DOCX, TXT, or PDF files or simply copy & paste your text. Experience real-time correction instantly and optimize your texts in no time.

Ideal for students, bloggers, freelancers, and companies that want to work without character limits, without paywalls, and with maximum transparency.